6 DBMS

Assignment Instructions

Please carefully read the instructions. They are very specific.  Label the answers clearly in accordance with the instructions. 

1. Pratt - Concepts of Database Management, Chapter 7

Assignment
Incorporate the below letters and numbers to organize the submission – do not include the questions.
1. Using the sample log found in Figure 7-11 on page 243 answer the following question.
 Suppose a catastrophe destroys the entire database after 8:16 but before 8:17. The DBA has a database backup that reflects the DB contents just prior to the start of the log. List the recovery steps that the DBA would take to bring the DB up to date. (10%)
 For which specific transaction(s) ID’s could the DB content be recovered? For which specific transaction(s) ID’s could the DB content not be recovered? Explain in your own words. (10%)

2. Using the log shown in Figure 7-19 on page 256 – explain which 2 transactions could cause a deadlock (if their start times were changed) and why only those two transactions could cause a deadlock. Use transaction ID’s to identify the transactions. (20%)

3.  Database integrity is vital. Distinguish between key integrity constraints and data integrity constraints. Describe each key integrity constraint in detail and give an example of each (other than those in the text). (25%)

4. Do you feel that data integrity constraint enforcement is best handled (enforced) by the DBMS or the programmer? Why? (20%)

Writing Org/Clarity/Spelling/APA (15%)

No more than 20% of the narrative portion of the submission may be direct quotes.

Submit the response in a word compatible document.
Name the document Last Name_DBMS (i.e. Smith_DBMS).